• Title/Summary/Keyword: Mg$B_2$COSSET

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Flux Jump of $MgB_2$ fabricated by commercial stainless steel tube enveloping technique (상용 스테인리스 스틸 튜브 봉합기법(COSSET)으로 제작 된 MgB$_2$flux jump 현상)

  • Lee, H.B.;Kim, B.J.;Kim, Y.C.;Jeong, D.Y.
    • Progress in Superconductivity
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    • v.4 no.1
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    • pp.27-31
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    • 2002

  • MgB$_2$samples have been prepared by a stoichiometry mixture of Mg and B inside stainless steel tubes(Commercial Stainless Steel Tube Enveloping Technique). XRD data show that there are no second phases like MgO. The transition temperature of specimens is 37.5 K with a sharp transition width of ΔTc within 1K. From magnetic hysteresis measurement, flux jump was shown up to 15K, which was higher than that of samples by other methods. We have concluded that the flux jump is mainly affected by impurities and second phases.

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Magnetic properties of $MgB_2$ and FeTi composites (Mg$B_2$와 FeTi 합성체의 자기적 성질)

  • 이헌봉;이준호;김영철;정대영
    • Progress in Superconductivity
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    • v.5 no.2
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    • pp.109-113
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    • 2004

  • MgB$_2$ and FeTi composites was prepared to study the effect of FeTi particles on superconductivity of MgB$_2$. The sample, which had contained magnesium, boron and FeTi particles, was synthesized by the Commercial Stainless Steel Tube Enveloping Technique(COSSET) at 92$0^{\circ}C$ for 2 hours. The structure and properties of the sample was investigated by XRD, SEM, and SQUID magnetometer. It was found that there was a little change of T$_{c}$ compared with pure MgB$_2$ superconductor in spite of high percentage of FeTi particles, and there was no proof of structure change of MgB$_2$ superconductor due to FeTi particles. But the high porosity which was appeared in the pure MgB$_2$ was disappeared in the composites. We conclude that FeTi particles do not influence the superconductivity of MgB$_2$ and it is expected that fe-Ti material system will be a good material for a tube of the PIT process and for a substrate of the film.m.

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